Eccentric lock-nut.



l A. ,B R0LUSKA.`

IFGCBNTRIG LOCK NUT. APPLIATION FILED SEPT. 5,*1908.

Patented Jan.'5, 1909.

No. 908,5Li2.

' UNITED sTATRs RATRNT onirica.

AMEL BRoLUsxA, oF DETROIT, MICHIGAN, AssIcNoR or ONE-'HALF To ALBERT A. DAY, or

DETROIT, MICHIGAN.

ECCENTRIC LOCSKNUT.

Specification of Letters Patent.

ratenteda'an. 5, Ieoe.

useful Improvements in an Eccentric Lock- Nut, of which the following is a specification.

My invention is designed to provide a novel eccentric lock nut and bolt combined, the same comprising. a nut and a locking portion extending longitudinally from the body of the nut, the body of the nut and the locking portion formed of a single piece of metal.

My invention consists of the construction, combination, and arrangements of parts hereinafter described and claimed and illustrated in the 'accompanying drawings in which,

Figurel, is a view in side elevation showing the bolt in place. Fig. 2 shows the bolt in sideelevation. Fig. 3 is a detail View of' the nut in longitudinal vertical section. Fig.' 4 is a plan view of the nut. Fi 5is an endview of the nut'and bolt. Figs.' 2 and 3 show. the bolt and nut in position to be applied the one uponl the other.

I carry out my invention as follows: In the drawings a represents abolt, the threaded extremity thereof being tapered for a desired distance-only, as indicated at b. The bolt may be tapered, for example, back for the distance of three or four threads, the remainder of the threaded portion of the bolt being of'uniform diameter in cross section. The `entire threaded portion of the bolt is formed with threads running `in the same direction.

The letter cY-lrepresents any piece ofmechanism to which the bolt is applied and upon which it is to be locked by my improved eccentric lock nut. The head of thelooltis indicated at d.

The nut is constructed with a main body portion e and with a locking portion or shoulder f formed integral with the body portion. The locking shoulder or portion of .the nut is formed with a longitudinal opening or slot indicated at g and with a perpherally extended slot h adjacent to the body portion. The locking portion or shoulder is thus formed with expansible wings a', z'. The body e of the nut is threaded to correspond with the main threaded portion of the bolt. The locking portion or shoulder however, is threaded straight at the bottom or one side thereof clear through uniformly with the interior threads of the body portion of the nut as indicated, for example, in Fig. 3 at j, but on the opposite side said locking portion or shoulder is tapered toward vits outer extremity as shown, the threads of said opposite side tapering toward the extremity of the shoulder so that the threads of the tapered portion of the locking( shoulder are eccentric to the longitudinal center or axis of the nut and of the bolt to which it is applied. The tapered portion of the locking shoulder. conforms to the tapered portion of the bolt.

It will be 'observed that the 4locking por- .tion or shoulder of the nut is of a funnel shape at one side thereof, the eccentric locking portion of said shoulder being on the upper side of the nut in the position shown in the drawings. I prefer also that the longitudinal slot g should be of tapering form to- Y -ward the extremity of the locking shoulder.

It will be evident that in forcing the nut upon the bolt the body of the nut will readily pass onto the body portion of the threads of the bolt and that the tapered portion of the nut, as the nut is forced upon the bolt, will bind upon the untapered threaded portion of the bolt. The construction of the locking -portion of the nut, 'as above described, affords a degree of elasticity or expansibility to the wlngs z', i, so that when the nut is run home upon the bolt the split portions or" wings of the locking shoulder will be spread apart allowing the nut to be run clear up to the workl c in which the bolt is located so that the inner face of the nut may impinge against the adjacent face of the work. I prefer to furrow or corrugate the innerface of the nutas indicated at 7c to afford a more effectual contact of the nut with the work. The tapered portion of the nut permits the locking portion of the nut to be run up onto the tapered portion of the bolt and then by means of a wrench the entire nut may be forced home upon the bolt the two wings c', @spreading to permit the tapered threaded portion of the shoulder to be run up upon the main threaded portion of the bolt thus securing a very eectual locking of the nut upon the bolt.

The operation of the device wlll now be fully understood. When the nut is being ito expand, the nut, feeding tighter and tighter upon the bolt, locking the n ut into v position thereupon, with a spring grip, and

when the nut has been run on into place upon the bolt it will be impossible for the nut to inadvertently work loose, inasmuch as the locking portion has expanded and grasped the bolt with sucli a pressure as to effectually bind the nut upon the bolt, the

expansion and grasping of the locking portionof the nut upon the bolt when in use preventing any vibration from working the nut loose, and still permit the nut to be removed by a suitable wrench without damaging the threads on either the bolt or the nut. When the nut is removed the locking portion will resume its normal position so that the vnut may be used again if desired. It will be understood that the threads on the bolt and on the nut are all of the same size.

It will be seen by reference to Fig. 3 that the side of the expansible locking portion ofthe nut opposite the longitudinal opening g is preferably made of the same thickness as that of the top of the nut while on the `opposite side of said locking portion adjacent to the said opening-the walls of the expansible wings 2'-, z', are made thinner.

It will be seen that in applieants invention the threads of the locking portion are not compressed upon the bolt after the nut is on, and that the threads of the locking portion are not injured by running the nut upon the bolt. In the manufacture of applicants nut the top and expansible poi-tion are castv of requiredform with the longitudinal and peripheral slots formed in the casting. The head or body portion of the nut is then tapped in the ordinary way up to the locking shoulder or portion, the threads in said expansible portion being cut therein by a suitable lathe Vavoiding any compression of said locking portion.

What I claim as my invention is:

l. An eccentric interiorly threaded lock nut formed with a body portion and with a longitudinally extended expansible locking portion integral therewith, said locking portion eccentrically tapered interiorly toward the outer extremity thereof, the outside diamete'r of the locking portion being less than that ofthe body portion.

2.'An eccentric interiorlyvthreaded lock nut formed with a body portion and with a longitudinally extended expansible `locking portion integral therewith, said locking portion tapered interiorly on one side thereof @ossea threaded upon the same plane on one side of the locking portion and made tapering upon the opposite side towardits outer extremity.

vlocking portion and bodyportion interiorly 4c. An eccentric interiorly threaded lock' nut formed with a body portion and -with a longitudinally extended locking portion integral therewith, said locking portion and body portion provided with an intervening peripherally extended slot, and said locking portion provided with a longitudinally extended opening, said locking portion tapered interiorly on one side thereof toward its outer extremity. v

5. An eccentric interiorly threaded lock nut formed with a body portion and with a longitudinally extended locking portion integral therewith, said locking portion and body portion provided with an intervening peripherally extended slot, and said locking portion provided with a longitudinally extended opening communicating at its inner ,end with the said slot, said locking portion ward its outer extremity.

6. 'In combination a bolt formed with a threaded portion tapered at the threaded extremity thereof, and an eccentric interiorly threaded lock nut formed with a body portion and with a longitudinally extended locking portion integral therewith, said locking portion being expansible and tapered interiorly toward the outer extremity thereof.

7. In combination a bolt, .formed with a threaded portion tapered at the threaded extremity thereof, and an eccentric inte-' riorly threaded lock nut formed with a body portion and with a longitudinally extended expansible locking portion, said locking portion tapered interiorly on one side thereof, and threaded on a straight line with the body of the nut on the opposite side thereof, said locking portion formed with a longitudinally extended opening, and said locking portion and body portion with an intervening peripherally extended slot communicat ing with said opening.

8. A11 eccentric interiorly threaded lock tapered interiorly on one side thereof tonut formed with a body portion and with a longitudinally extended locking portion integral therewith, said locking portion and body portion provided with an intervening peripherally extended slot, and said locking portion provided with a longitudinally extended openinof communicating at its inner end with -sai slot, said locking portion tapered interiorly on one lside thereof. toward iso its outer extremity, and said opening made interiorly on one side thereof toward its outer extremity, the walls of the expansibiev portion being of less thickness adjacent to said longitudinal opening than upon the op- 15 posite side thereof. 1 y

In testimony whereof I have signed this specification in presence of two witnesses.

AMEL BROLUSKA. Witnesses N. S.`WRIGHT, G. E. M GGRANN.' p 

